Former heavyweight world champion Wladimir Klitschko has retired from boxing - ruling out a rematch with Britain's Anthony Joshua. The Ukrainian, 41, was knocked out in the 11th round by current champion Joshua at Wembley Stadium in April.

Joshua, 27, had hoped Klitschko would sign his rematch clause for a proposed fight in Las Vegas on 11 November.

"I have achieved everything I dreamed of, and now I want to start my second career after sports," said Klitschko.

An encore for Usain Bolt? Unthinkable. A loss in his going-away party? Impossible. Track's fastest man and greatest entertainer made both those points clear Tuesday leading to his final world championships this week.

It was an engaging hour filled with reminisces, chats about his plans and thoughts about where his troubled and soon-to-be-starless sport might be headed.

Ivory Coast will be ready to stage the new-look African Nations Cup in 2021, the West African nation's president has insisted.

The Confederation of African Football announced last month that the tournament will be moved from its traditional January and February slot to June and July, and will -- like the European Championship -- be expanded from 16 to 24 teams.

STANFORD, Calif. -- Maria Sharapova played her first WTA match in the United States since 2015 and beat Jennifer Brady 6-1, 4-6, 6-0 on Monday night in the opening round of the Bank of the West Classic.